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Question

Which of the following is not correct for a gas undergoing isothermal expansion?

A
ΔU=0
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B
ΔT=0
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C
W=0
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D
ΔH=0
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Solution

The correct option is C W=0
  • For isothermal process, ΔT=0
    we know
  • At constant volume, qv=CvΔT=ΔU
    If ΔT=0
    ΔU=0
  • ΔH=ΔU+Δ(PV)=ΔU+nRΔT =0
  • Now from first law of thermodynamics ΔU=q+W
    If ΔT=0 then ΔU=0 and W=q
    Hence W0

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